Some activated B cells are transformed into ________ cells that secrete antibodies, and others remain as ________ cells
A) plasma / memory B
B) lymphocytes / memory B
C) immunoglobulin / plasma
D) immunoglobulin / TH
Answer: A
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Most dinosaurs became extinct
a. 10,000 years ago. b. 1 million years ago. c. 500 million years ago. d. 65 million years ago. e. 1 billion years ago.
Mitochondria contain their own DNA, separate from that of the rest of the cell
Indicate whether the statement is true or false
Why do the same trans-regulatory elements lead to very different morphology in different species of organisms?
A. Different species have genetic codes that use different codons, leading to different amino acid sequences. B. Morphological change depends on sequence mutations in enhancers. C. These regulatory elements have no effect on morphology, only metabolism. D. The transcription factor activates different combinations of enhancers and downstream genes. E. The trans-regulatory elements in different lineages have independently evolved the same sequence, by convergent evolution.
Glucose molecules are to starch as ________ are to proteins
A) oils B) amino acids C) fatty acids D) monosaccharides